Apparatus and method of driving discharge tube lamp and liquid crystal display using the same
First Claim
Patent Images
1. A driving apparatus having a discharge tube lamp, comprising:
- a DC power supplier for producing DC power;
a burst mode inverter for converting the DC power to AC power, wherein the inverter responds to a Pulse Width Modulation frequency to modulate the DC power to produce the AC power, wherein the AC power is pulse width modulated; and
a controller for generating the Pulse Width Modulation frequency and adjusting a duty-on-time of the Pulse Width Modulation frequency in the range of about 40% to 99%,wherein the controller multiplies a frame frequency to generate the Pulse Width Modulation frequency, and wherein the controller adjusts the duty-on time of the Pulse Width Modulation frequency to be within 40% and 99% of one period of the Pulse Width Modulation frequency.
2 Assignments
0 Petitions
Accused Products
Abstract
A burst mode inverter that drives a discharge tube lamp in a manner that produces more emissions. A DC power supplier produces DC power. An inverter converts that DC power to AC power having a Pulse Width Modulated frequency that is between 2 and 3 times the system'"'"'s frame frequency. A duty cycle controller controls the duty-on-time of the Pulse Width Modulation frequency so as to be with the range of about 40% to 100%.
-
Citations
14 Claims
-
1. A driving apparatus having a discharge tube lamp, comprising:
-
a DC power supplier for producing DC power; a burst mode inverter for converting the DC power to AC power, wherein the inverter responds to a Pulse Width Modulation frequency to modulate the DC power to produce the AC power, wherein the AC power is pulse width modulated; and a controller for generating the Pulse Width Modulation frequency and adjusting a duty-on-time of the Pulse Width Modulation frequency in the range of about 40% to 99%, wherein the controller multiplies a frame frequency to generate the Pulse Width Modulation frequency, and wherein the controller adjusts the duty-on time of the Pulse Width Modulation frequency to be within 40% and 99% of one period of the Pulse Width Modulation frequency. - View Dependent Claims (2, 3, 4, 5, 14)
-
-
6. A driving method of a discharge tube lamp, comprising:
-
producing DC power; generating a Pulse Width Modulation frequency and adjusting a duty-on-time of the Pulse Width Modulation frequency in the range of about 40% to 99%; and utilizing the Pulse Width Modulation frequency to convert the DC power into AC power to be applied to the discharge tube lamp, wherein the AC power is pulse width modulated; wherein generating the Pulse Width Modulation frequency includes multiplying a frame frequency to generate the Pulse Width Modulation frequency, and adjusting the duty-on time of the Pulse Width Modulation frequency to be within 40% and 99% of one period of the Pulse Width Modulation frequency. - View Dependent Claims (7, 8, 9)
-
-
10. A liquid crystal display, comprising:
-
a liquid crystal display panel; a DC power supplier for producing DC power; a burst mode inverter for converting the DC power to AC power, wherein the inverter responds to a Pulse Width Modulation frequency to modulate the DC power to produce the AC power, wherein the AC power is pulse width modulated; a controller for generating the Pulse Width Modulation frequency and adjusting a duty-on-time of the Pulse Width Modulation frequency in the range of about 40% to 99%; and at least one discharge tube which turns on in accordance with the AC power supplied from the inverter to irradiate light to the liquid crystal display panel, wherein the controller multiplies a frame frequency to generate the Pulse Width Modulation frequency, and wherein the controller adjusts the duty-on time of the Pulse Width Modulation frequency to be within 40% and 99% of one period of the Pulse Width Modulation frequency. - View Dependent Claims (11, 12, 13)
-
Specification